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Research

Research lectures, seminars and events

The events listed in this area are research seminars, workshops and lectures hosted by Durham University departments and research institutes. If you are not a member of the University, but  wish to enquire about attending one of the events please contact the organiser or host department.


 

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Events for 15 December 2017

'Hell, Heaven and Hope. A journey through life and the afterlife with Dante', Exhibition curated by Dr Annalisa Cipollone

9:00am to 11:55pm, Palace Green Library, Durham University

Contact annalisa.cipollone@durham.ac.uk for more information about this event.


Florian Niedermann: Extra dimensional self-tuning of the vacuum energy: obstructions and ways around

1:00pm, CM221

Gravitational models of self-tuning are those in which vacuum energy has no observable effect on spacetime curvature even though it is a priori unsuppressed below the cut-off, thereby avoiding the cosmological constant problem. We study a class of six dimensional braneworld models that implement self-tuning by decoupling vacuum energy from the gravitational sector induced on the brane. Special care is taken to come up with a consistent core model that resolves the brane as cylindrical vorton carrying charge and current. By studying the setup in a thin-wall approximation for vanishing charge, we find that phenomenological constraints push the theory into a pathological parameter regime. In the second part, we will propose a model independent analysis of self-tuning based on a spectral decomposition of the exchange amplitude for conserved sources of energy-momentum. This provides us with a deeper understanding of the failure of the extra dimensional model and allows us to identify new obstructions to self-tuning, complementing a famous no-go theorem by Weinberg. Finally, we search for novel ways around our obstructions and highlight different interesting possibilities.

Contact daniele.dorigoni@durham.ac.uk, jyotirmoy.bhattacharya@durham.ac.uk for more information about this event.


James Threlfall: What can test particles tell us about magnetic reconnection in the solar corona?

2:00pm, CM219

Solar flares are highly explosive events which release significant quantities of energy (up to 10^32 ergs) from specific magnetic configurations in the solar atmosphere. As part of this process, flares produce unique signatures across the entire electromagnetic spectrum, from radio to ultra-violet (UV) and X-ray wavelengths, over extremely short length and timescales. Many of the observed signals are indicative of strong particle acceleration, where highly energised electron and proton populations rapidly achieve MeV/GeV energies and therefore form a significant fraction of the energy budget of each event. It is almost universally accepted that magnetic reconnection plays a fundamental role (on some level) in the acceleration of particles to such incredible energies.
In this talk, I will briefly summarise a series of recent experiments where test particles are introduced into a number of 3D magnetic reconnection configurations. I will discuss the particle population response to each configuration and what these responses might infer for both simulations and observations of magnetic reconnection in the flaring solar corona.

Contact david.bourne@durham.ac.uk for more information about this event.